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Tech Area => General Buick Tech => Topic started by: Buca on April 15 2011, 09:53:28 PM

Title: High Flow Cat
Post by: Buca on April 15 2011, 09:53:28 PM: Ok, Just replaced the stock Muffler with a Walker quiet flow muffler and also running a Full Throttle Test pipe. And now brought to my attention, Davidson County In Nashville has Emissions Testing, so my car won't past without a cat. Any suggestions for a High Flow cat That I could buy and pass emissions with???

Story of my life, More money money taking away from my alky kit.....
Title: High Flow Cat
Post by: daveismissing on April 15 2011, 10:23:44 PM: I had trouble finding the flange so I bought a cat from Kirban.
If you have a test pipe you have a flange that you can use, maybe buy a 3" cat and adapters. When you eventually get a 3 " downpipe and bigger exhaust just reuse?
Title: High Flow Cat
Post by: Buca on April 15 2011, 10:32:52 PM: Quote from: "daveismissing @ Fri Apr 15, 2011 9:23 pm"
I had trouble finding the flange so I bought a cat from Kirban.
If you have a test pipe you have a flange that you can use, maybe buy a 3" cat and adapters. When you eventually get a 3 " downpipe and bigger exhaust just reuse?

That would be my plan, reuse it and the 3" Exhaust comes with next years income tax money....... Still Trying to splurge for the Alky Kit.....
Title: High Flow Cat
Post by: SuperSix on April 15 2011, 11:28:51 PM: used to pass without a cat. Well, I had a cat, but it as hollowed out, and I had to do a bunch of other shit. Emissions PROM, RXP, etc. PIA
Title: High Flow Cat
Post by: Steve Wood on April 16 2011, 10:03:32 AM: Quote from: "Buca @ Fri Apr 15, 2011 8:32 pm"
Quote from: "daveismissing @ Fri Apr 15, 2011 9:23 pm"
I had trouble finding the flange so I bought a cat from Kirban.
If you have a test pipe you have a flange that you can use, maybe buy a 3" cat and adapters. When you eventually get a 3 " downpipe and bigger exhaust just reuse?

That would be my plan, reuse it and the 3" Exhaust comes with next years income tax money....... Still Trying to splurge for the Alky Kit.....

Unless you are aiming for low tens, or quicker, I would stick with a 2.5" exhaust and use the money for something else.

With the exception of the old cross flow three inch from ATR, most of the three inch exhausts on Regals sounded really bad to me.
Title: Re: High Flow Cat
Post by: Scoobum on April 16 2011, 10:35:14 AM: Whatever exhaust you plan to go with...make sure it's stainless. Buy once.
Title: High Flow Cat
Post by: daveismissing on April 16 2011, 11:55:09 AM: Quote from: "Steve Wood @ Sat Apr 16, 2011 9:03 am"
Quote from: "Buca @ Fri Apr 15, 2011 8:32 pm"
Quote from: "daveismissing @ Fri Apr 15, 2011 9:23 pm"
I had trouble finding the flange so I bought a cat from Kirban.
If you have a test pipe you have a flange that you can use, maybe buy a 3" cat and adapters. When you eventually get a 3 " downpipe and bigger exhaust just reuse?

That would be my plan, reuse it and the 3" Exhaust comes with next years income tax money....... Still Trying to splurge for the Alky Kit.....

Unless you are aiming for low tens, or quicker, I would stick with a 2.5" exhaust and use the money for something else.

With the exception of the old cross flow three inch from ATR, most of the three inch exhausts on Regals sounded really bad to me.

My thinking was one usually/evenually ends up with a 3 inch down pipe so a 3 inch cat makes sense?
Hooker or Pypes behind that, suppose thats 2.5 usually?
Title: Re: High Flow Cat
Post by: Scoobum on April 17 2011, 10:33:26 AM: A 3" cat makes sense...but you have to install the DP...and the exhaust...and then take a measurement to find out what length cat you need.
Title: High Flow Cat
Post by: Mountain GN on April 26 2011, 02:41:00 AM: Quote from: "SuperSix @ Fri Apr 15, 2011 7:28 pm"
used to pass without a cat. Well, I had a cat, but it as hollowed out, and I had to do a bunch of other shit. Emissions PROM, RXP, etc. PIA

:snakeman:

Mine used to pass the sniffer test in Nevada with a hollow cat.

I guess it depends on the state, but its worth trying, if you're not afraid of getting caught.
Title: High Flow Cat
Post by: Wrecked Em on April 26 2011, 07:58:35 PM: I could not get mine to pass emissions in Chicago without a cat. It was close though. If needed, get an emissions chip from Eric Marshal.